Energy-Saving SSD Cache Management for Video Servers with Heterogeneous HDDs

Dynamic adaptive streaming over HTTP (DASH) technique, the most popular streaming method, requires a large number of hard disk drives (HDDs) to store multiple bitrate versions of many videos, consuming significant energy. A solid-state drive (SSD) can be used to cache popular videos, thus reducing H...

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Bibliographic Details
Published in:Energies (Basel) 2022-05, Vol.15 (10), p.3633
Main Authors: Kim, Kyungmin, Song, Minseok
Format: Article
Language:English
Subjects:
Arrays
Bandwidths
Data replication
Data storage
Disk drives
Energy conservation
Energy consumption
Energy efficiency
low-power computing
Memory management
Power management
Solid state devices
SSD management
Streaming
Video
video storage systems
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Summary:Dynamic adaptive streaming over HTTP (DASH) technique, the most popular streaming method, requires a large number of hard disk drives (HDDs) to store multiple bitrate versions of many videos, consuming significant energy. A solid-state drive (SSD) can be used to cache popular videos, thus reducing HDD energy consumption by allowing I/O requests to be handled by an SSD, but this requires effective HDD power management due to limited SSD bandwidth. We propose a new SSD cache management scheme to minimize the energy consumption of a video storage system with heterogeneous HDDs. We first present a technique that caches files with the aim of saving more HDD energy as a result of I/O processing on an SSD. Based on this, we propose a new HDD power management algorithm with the goal of increasing the number of HDDs operated in low-power mode while reflecting the heterogeneous HDD power characteristics. For this purpose, it assigns a separate parameter value to each I/O task based on the ratio of HDD energy to bandwidth and greedily selects the I/O tasks handled by the SSD within limits on its bandwidth. Simulation results show that our scheme consumes between 12% and 25% less power than alternative schemes under the same HDD configuration.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15103633